Fluid operated tool



June 9, 1931. R. o. OLANDER V FLUID OPERATED TOOL Filed April 24. 1928 gmmlrom P. 0. Olarzden Patented June 9, 1931' p UNITED STATES;

IP TE: T I OFFICE 1 ROBERT, o. OITJANDER, or: cAIiUMEr, MICHIGAN FLUID OPERATED moon Application filed April 24,

In fluid operated tools of the pneumatic hammer type andparticularly those in which i this may be due to minute irregularities in "the alignment of the bearing parts. If for example, a tool is forced tightly against the work, particularly a mounted tool with a screw feed or the like, there is a tendency of the parts forming the cylinder member to buckle to an almost infinitesimal degree and yet sufliciently to throw'the guiding means for the hammer extension out of line, resulting in a slight binding action on the hammer extension, with the result'that the latter is scored. i

The object of the present invention is to provide means for overcoming the difficulty and the structureherein disclosed has been found to materially eliminate the scoring action. 7

In the accompanying drawings:

Figure 11is a longltudinal sectional view of the preferred embodiment of the invention. a

I Figure 2 1s a detail sectional view of the head bushing and, the bearing bushing therein. 1 r I Figure 3 is a rear elevation of the same. Figure 4 is across sectional view onthe line 4' 1: of Figure 2. r Y The cylinder member of the tool may be of any well-known or desired construction. As shown, it comprises a barrel 5, into the front end of which is fitted-a head bushing 65, having an outstanding flange 7 that is clamped between the barrel 5 and the usual chuck housing 8.

The bushing 6 chambered, as shown at 9, and loosely fitted into said chamber is a bearing bushing 10. It will be understood that while in the drawings amaterial amount of space is shown around and at'the ends of the bearing bushhas its rear end portion I of the inventlon. i I ea 7 ing 9, in actual practice, this does not amount 1928.", serial 1272542., i 3

to, more'than a fewthousandths' of aninch.

The piston'h'ead of the'tool 'is 'shownrat 1 1 and is provided with'the usual hammer .extension 12,1which in this case has a snug slid ing 'fitin the bearing-bushing 10. At it's 5:; front endit is slidably interfitted with the chuck 12a, adapted to receive a tool; The rear end portion of such a; tool is shown at 13.

The head bushing 6 is provided with an annularexternal groove 14 that;v has commuco' nication with the chamber 9 through a plu- 'rality of ports15 and'said groove l4 is'als o I in communication withthe front 'end' of a I piston chamber 16 by means of longitudinal channels 17 cut in the periphery of the: head 1:? bushing 6 and extending from the channel' 14 through the rear end of said bushing. In order to hold the bearing bushing 10 against detachment, it is provided with an annular groove 1 8 that loosely receivesa retaining pin t 19 carried transversely by the head bushin 6. IZVithithisstructure, it will of course'b'e evident that the hammer extension 12 has a sliding bearing in the bearing bushing 10, J

and "that the latter has a limited lateral and longitudinal movement in thehead bushing. By allowing the motive fluid access to the spacearound the bushing l'O, said bushing V has in efie'ct a floating movement due not to only to the'entrance of the fluid but to lubricant carried by said fluid. This, it is found material reduces the dangerfof'the hammer extension being scored and resultantly obviates breakage ofthis part; e 7 From the foregoing, it is thought that the construction, operation and many advantages ofthe herein described invention will be apparent to those skilled agin the art, without further" description, and'it; will be underso stood that various changes in the size, shape,

, proportion and minor 'detailso'f construction may "be'resorted to without departing from the spirit or sacrificing any of the advantages 1 piston has a reciprocatory bearing, said ele- L1 to have a fl0ating:action.

ment having a limited lateral play to permit its lateral movement by reason of lateral pressure thereon of the piston.

2. In a fluid operated tool, the combination with a cylinder member and a reciprocatory piston therein, of a bushing in the cylinder member and .in which the pistonhas a reclprocatory bearing, said ibushing having limited lateral freedom of movement in the ,cylinder. member to permit its lateral movement by reason of ilatera'l 1pressurethereon of the piston.

3. In a fluid operated tool, the combination with a cylinder member having .a piston chamber, of a reciprocatory piston in the chamber having a hammer extension, and a bushing in'the cylinder-membertand in which the Ihammer'extensi-on has a reciprocatory bearing, said I bushing having limited lateral freedom of movement to permit it-to accommodate itself :to any Llateral pressure that is brought against it by the piston during its reciprocation V I p 4; In aifiuidoperatedtoohthe combination with .a cylinder member having ,a piston chamber, ofya reciprocatory piston in the 7 ch amberhaving aIhammerextension a bushinglin thecylindenmember andin .Which the hammer extensionlhasa reciprocatory bear- I ing, said :bushinghaving limited lateral free dom of movement to permit itto'accommodate itself :to any lateral pressure .that is brought against it by the piston during its reciprocation, 'and means for directing fluid .under pressure around andagainst said bushing to .cause it :to have a floating action.

5. 'In a fluid operated tool, the combination with a cylinder member having a piston chamber, of a reciprocatory piston .in the chamberihaving a hammerextension, a .bushing inthe cylinder member andin vvhichthe hammer extension has areciprocatony :bearting,saidbushingdiaving limitedlateral freedom of movement to permit iitito accommodate itself to anyllateral pressure that is brought against-it by .the piston during its :reciprocatiomnnd a emotive fluid passagevvaty leading from the front end of the piston chamber and directing fluid nn derpressure around and against sald bushing 1700211156113 6.- In .a.fluid-operatedrtool, the combination with a cylinder vmember icomprlsing a .barrel having'a piston chamber therein, of ahead bushing for the frontendofthe barrelhaving an internal chamber, -:a bearing bushing havinga looseflt in-theu-internal chamber and capableof limited lateral playitherein, and a piston :in the piston .chamber having .a .ham-

mer extension, said extension having asli ding fit in the bearing bushing.

7, In'afluidoperated-ztool,tthe combination with a cylinder :member comprising a barrel ihavin g n piston'chamber thereimof a vhead bushing for the front endofthe barrel hay-- 

